Improvement in hollow pressure-plates



UNITED STATHSPATHNT OFFICE.

vJOHN B. FONTAINE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO HOFF,FONTAINE & ABBOTT.

IMPROVEMENT IN HOLLOW PRESSURE-PLATES.

Specification forming part of Letters Patent No. 59,7] 6, dated November13, 1866.

-ing fabrics; andV my improvement consists in riveting such plates atthe points where they are stayed, as described hereinafter, so that theplates may more etlectually resist the pressure and heat to which theyare subjected, and so that a fracture ot' one or more of the stays maynot impair the efficiency of the plate.

In Order to enable others to make my invention, I will now proceed todescribe the manner of constructing the same.

On reference to the accompanying drawings, which form a part of thisspeciiication, Figure l is a plan view, partly in section, of a hollowcast-iron pressure-plate made in accordance with my improvement; andFig. 2 a vertical section of part of the plate.

Hollow plates of cast-iron heated by steam have been long in use forpressing stockings and other knitted articles of wearing-apparel.

The extent of such plates and the pressure .Ito which they are subjectedinvolve the necessity of employing stays to prevent the yielding andfracture of the plates and these stays consist of solid cylinders ofcast-iron crossing, vertically, the space within the plates, thesecylinders being east with and forming a part of the plates, as seen ata, Fig.2. It has been found that these stays frequently become fracturednear one end or the other, either during the shrinking of the metalimmediately after casting or through the heat and pressure subsequentlyapplied. The plate is consequently impaired, and in some cases rendereduseless. In Order to obviate this evil, I proceed as fOllows:

After the plate A', with its stays a, has been cast, I first plane theupper and lower surfaces, and then drill holes entirely through theplate at every point where a stay occurs, the hole being countersunkabove and below. Into eachv hole I introduce a snugly-fittin g rod, b,in a heated state and rivet both ends, after which I again plane b oththe upper and lower surfaces, when the plate is complete and ready foruse. Y

Plates thus constructed will remain entire, although subjected to themost severe pressure 5 and even if a fracture of one or more of thestays-has taken place during the cooling of the casting, the rivetsprevent the Occurrence of any detrimental result Of such fractures.

I claim as my invention and desire to secure by Letters Patent- A holloweast-iron die or plate stayed and riveted in the manner and for thepurpose described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOHN B. FONTAINE.

Witnesses:

H. HOWsON,

JOHN WHITE.

